With the given script it is possible to reflash the same (or even an older) version of a plain Apple firmware and thereby remove any patches by third-party vendors.
It is important that this must only be done on a system without a CPU upgrade (using the 7447 and 7448) that requires firmware patches. The Mac would be dead until the reinstallation of an original G4 or other type of accelerator !
NVRAMRC patches for booting into Mac OS 9 will survive a flash, but can get cleared using Command-Option-P-R. Other similar patches (as the lba-48 property) would have to be reapplied.
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